2002 maxima bad fuel economy
I have a 2002 Maxima SE with the manual transmission (96,500) and I have been pretty happy with it up until a few weeks ago. I predominantly drive on the highways now and i have sometimes not gotten better than 20mpg on the highway. I am kinda frustrated with it because I have new spark plugs ( 5,000 miles ago) recent tune up, and I havent really had my foot in it. I was thinking it could be the O2 sensors, but i was told if they were bad it would set off the check engine light ( mine is not on). Tire pressure is normal, i am using premium fuel, and air filter is new. Any suggestions?
Also when i turn on the car when its cold i hear a clacking noise from the engine for a second or two and then it goes away.. thoughts/
Thanks
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